Merge pull request #1760 from Vinai/patch-16

Add getDependencies method name to example.

Author: keharper

guides/v2.3/extension-dev-guide/declarative-schema/data-patches.md

@@ -15,12 +15,16 @@ The declarative schema approach removes the version from the `setup_module` tabl
 
 The sequence of installing patches is handled through a dependency-based approach. Patches can either be independent or dependent on other patches. Independent patches can be installed in any sequence. A dependent patch requires a minimal number of patches so that it can be installed successfully.
 
-To define a dependency in a patch, make a static reference to the patch class. The class can be in any module.
+To define a dependency in a patch, add the method `public static function getDependencies()`
+to the patch class and return the class names of the patches this patch depends on. The dependency can be in any module.
 
 ``` php
-return [
-  \SomeVendor\SomeModule\Setup\Patch\Data\SomePatch::class
-];
+public static function getDependencies()
+{
+    return [
+        \SomeVendor\SomeModule\Setup\Patch\Data\SomePatch::class
+    ];
+}
 ```
 
 The following code sample defines a data patch class that has a dependency.